Use AC coupling to each digit to measure the ignition waveform and detect the breakdown point like with a tunnel diode trigger. Use a higher compliance voltage and greater negative resistance (constant current drive?) to lower breakdown jitter.
On Sat, 16 Jul 2016 00:08:45 -0700, you wrote: >Yes, I was planning on using a high speed photo diode to actually >measure the turn on time of the digits. I hadn't thought of the turn OFF >time, do I want the old digit to be turned off before the new one lights >up or for them to be overlapping? I have been thinking about what >threshold to use, 50% intensity is probably about as good as any other. >It might turn out that different digits turn on differently, so I will >have to calibrate each one separately. > >John S. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.